You have two options, clean in place or remove, clean and reinstall. If you can fairly easily remove them and take them outside the building, you can use a pressure washer or ultra-sonic cleaning system. What is involved in taking them down and replacing them? The other option is to clean them in place, but the effectiveness of that depends on them being a style that allows easy wiping and or brushing. If you have a lot of small slots and bars, the time will be prohibitive. Also how dirty are they? Your best approach is ... — Lynn E. Krafft, ICAN/ATEX Associate Editorlekrafft@juno.com